Our vet just placed a Quaker who was 19 and was very attached to his owner, who recently passed. Poor bird plucked its feathers and kept shaking its head. It actually did better at the vet's and is doing really well in a new home. The vet said that the change would do him good because at home he was freaking out about his owner being gone. Maybe a new start--different toys, different location of cage, or new cage might help. I haven't had any experience with this myself. Bless you for trying to help the poor bird!